Other internet music publishers...

composermusic.com
(excellent internet-based music publisher that provides classical music for sale along with numerous free pieces)

choralweb.com

Coalition of Internet Church Music Publishers

Other worship-related websites...

Worship and Church Music
(personal website of The Rev. Larry D. Ellis, President of Adoration Publishing)

a collection of interesting links about worship and Christian music

Sibelius Music Notation Software

Sibelius Music - Site for viewing, hearing and printing of other music on-line